Lennox LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit Installation guide

Brand: Lennox

Model: LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit

Type: Installation guide

Lennox LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit is used for gas conversion as shown in table 1. The 10th character on the unit nameplate determines the type of gas valve. For example, ZGA060S4BH1G would contain a two-stage, high heat gas valve. The kit includes orifices, spring kit, conversion plates, conversion sticker, acrylic sheet, and J/P19 harness. The installation process varies depending on the specific unit model. However, the general steps involve turning off the main manual shut-off valve and electrical supply to the unit.

Page 1

507586-03

12/2020

Supersedes 507586-02

INSTALLATION INSTRUCTIONS FOR LP KIT USED ON

LGM/LGH/KG/ZG/SG 024-090 PACKAGED ROOFTOP UNITS

NATURAL TO LP (PROPANE)

GAS CHANGEOVER KIT

PACKAGED UNITS KITS

AND ACCESSORIES

WARNING

This conversion kit is to be installed by a

qualied service agency in accordance with the

manufacturer’s instructions and all applicable

codes and requirements of the authority having

jurisdiction. If the information in these instructions

is not followed exactly, a re, an explosion or

production of carbon monoxide may result causing

property damage, personal injury or loss of life.

The qualied service agency is responsible for the

proper installation of this kit. The installation is not

property and complete until the operation of the

converted appliance is checked as specied in the

manufacturer’s instructions supplies with the kit.

Shipping and Packing List

Package 1 of 1 contains:

7 - Orices (3 in 21A01)

1- Spring kit (2 in 14N21 & 21A02)

1- Bag assembly containing:

3-Conversion plates (1 in 21A02)

1-Conversion sticker

1-Acrylic sheet

1-J/P19 harness (14N21 & 21A01 only)

Requirements

This conversion kit shall be installed by a qualied service

agency. A qualied service agency is any individual, rm,

corporation or company which either in person or through

a representative is engaged in and is responsible for the

connection, installation, repair or servicing of gas utili-

zation equipment or accessories, who is experienced in

such work, familiar with all precautions required, and has

complied with all the requirements of the authority having

jurisdiction.

Canadian installations only - The conversion shall be

carried out in accordance with the requirements of the

Provincial authorities having jurisdiction and in accor-

dance with the requirements of the CAN/CGA-B149.1 and

.2 Installation Code.

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, personal

injury or loss of life. Installation and service must be

performed by a licensed professional installer (or

equivalent), service agency or the gas supplier.

Application

The LP/propane gas changeover kit is required for gas

conversion as shown in table 1. The 10th character on

the unit nameplate determines the type of gas valve.

For example, ZGA060S4BH1G would contain a two-

stage, high heat gas valve.

Installation

1 - Turn main manual shut-o valve o and turn o

electrical supply to unit. Set thermostat to “O”

position.

2 - Open access panels as shown in gure 1. On LGM/

LGH/KG/SG units, remove the mullion between the

heat and compressors sections.

TABLE 1– KIT APPLICATION

Unit Cat. No. Part No. Htg. Stages 10th Character

LGH036-072S, KG 024-090, ZG 036-074 14N20 614839-01 Single-Stage S, M, T, W, Y, Z

LGM/LGH036-072S/H/U, KG 024-090, ZG 036-074, SG

036 & 060 14N21 614839-02 Two-Stage Med & High H, U, Q, X

LGM/LGH036-072H, LGM/LGH036-074U, SG 036 & 060 21A01 614839-03 Two-Stage Standard B

LGH048-074U, LGH060H 21A02 614839-04 Four-Stage High D

Page 2

CAUTION

As with any mechanical equipment, personal injury can

result from contact with sharp sheet metal edges. Be

careful when you handle this equipment.

ZG 036-074 UNITS

REMOVE

PANELS

REMOVE

HEAT CONTROL

ACCESS PANEL

Figure 1

IMPORTANT-The gas supply shall be shut o prior to

disconnecting the electrical power, before proceeding

with this conversion.

3 - Remove and retain four screws securing manifold

to burner box; remove manifold. See gure 2, 3, 4,

or 5.

4 - Remove orices from manifold and install the

orices provided in kit. Unit will have 3, 5, or 7

burners. Replace only the orices which have a

burner installed.

On four-stage units only, the two left orices are

0.050” and the right ve orices are 0.052”. See

gure 4 for proper orice placement.

CAUTION - Tighten orices with pipe threads to 6.25

ft.lbs. Do not overtighten.

IMPORTANT - Do not use thread compound on gas

orices.

5 - Replace the manifold and secure with retained

screws.

6 - Install spring kit as shown in gure 6 for single-

stage gas valves, gure 7 for two-stage and four-

stage White Rodgers gas valves, and gure 8 for

two-stage Honeywell gas valves. Also refer to the

manufacturer’s instructions provided with spring

kit. When installing 14N21 kit, discard the unused

spring kit.

BURNER BOX ASSEMBLY - ZG 036-074

ORIFICES

(3, 5, OR 7)

Remove and retain two

screws on each side;

remove manifold.

GAS

VALVE

GAS

MANIFOLD

BURNERS

Figure 2

Page 3

GAS

VALVE GV3

BURNER BOX ASSEMBLY - LGH 036, 048, 060, 074U - FOUR-STAGE HEAT

GAS

MANIFOLD

ORIFICES

(0.050)

Remove and retain two

screws on each side;

remove manifold.

Remove and retain two

screws on each side;

remove manifold.

ORIFICES

(0.052)

GAS

VALVE GV1

Note - Ignitors and sensors

for all capacities are shown.

Figure 4

BURNER BOX ASSEMBLY - LGM/LGH/KG 024-090

GAS

VALVE

GAS

MANIFOLD

ORIFICES

(3, 5, OR 7)

Remove and retain two

screws on each side;

remove manifold.

Remove and retain two

screws on each side;

remove manifold.

Figure 3

Page 4

BURNER

COMBUSTION

AIR INDUCER

VENT

CONNECTOR

GAS VALVE PRIMARY

LIMIT

BURNER BOX ASSEMBLY - SG 036 & 060

ORIFICES

3, 5, OR 7

REMOVE AND RETAIN

TWO SCEWS ON EACH

SIDE; REMOVE MANIFOLD.

Figure 5

INLET

PRESSURE

TAP

Remove regulator cap screw and pressure regulator

adjusting screw.

Remove existing spring.

Insert replacement spring.

Install the new plastic pressure regulator adjustment

screw so that the top of the screw is flush (level) with

the top of the regulator. Turn the pressure regulator

adjusting screw clockwise six complete turns, This

adjustment provides a preliminary pressure setting of

about 10.5” w.c. (2.6 kPa) for the LP regulator.

Check regulator setting either with a manometer or by

clocking the gas meter.

Reinstall cap screw.

CONVERTING SINGLE-STAGE GAS VALVE

(Natural to LP)

CAP SCREW

PRESSURE REGULATOR

ADJUSTING SCREW

(White)

SPRING

(Red)

GAS INLET

Figure 6

Page 5

CONVERTING TWO- & FOUR-STG. GAS VALVES

(White Rodgers Natural to LP/Propane)

High Low

Remove both high fire and low fire springs from the gas valve.

Replace both high fire and low fire springs with the provided LP

springs color-coded white.

Install the high fire adjustment screw and adjust approximately

12 turns.

Install the low fire adjustment screw and adjust approximately

8 turns.

Install both regulator screw covers.

REGULATOR

COVER SCREW

PLASTIC REGULATOR

ADJUSTMENT SCREW

REGULATOR SPRING

Figure 7

1. Turn off the gas supply to the unit.

2. Remove the pressure regulator cover assembly. See the gas

valve illustration below.

3. Remove the existing stem/spring assembly.

4. Insert the replacement stem/spring assembly.

5. Replace the pressure regulator cover assembly and tighten the

screws.

6. Apply the conversion label to the gas control.

CONVERTING TWO-STAGE GAS VALVE

(Honeywell Natural to LP/Propane)

PRESSURE

REGULATOR

COVER ASSEMBLY

STEM

(SPRING ASSEMBLY,

LP - BLACK)

Figure 8

Install J/P19 Jumper Harness

Two Stage Gas Valves Only

1 - Locate J19/P19 combustion air blower connectors

in divider panel between heat and compressor

sections.

2 - Disconnect J19/P19.

3 - Install kit harness between disconnected plugs.

See gure 9.

INSTALL JUMPER PLUG

COMBUSTION

AIR BLOWER

P19 J19

COMBUSTION

AIR BLOWER

P19 J19

J21 P21

2-Install kit harness.

1-Disconnect

P19/J19.

DIVISION

PANEL

HEAT SECTION COMPRESSOR

SECTION

Figure 9

Page 6

Start-Up and Adjustment

1 - Replace heat section access panels and mullion.

2 - Close heat section access panel.

A - To place unit in operation:

1 - Turn main manual shut-o valve on.

WARNING

Danger of explosion. Can cause injury or

death. Do not attempt to light manually. Unit

has a direct spark ignition system.

2 - Wait ve minutes, then open manual knob on gas

valve and replace compressor access panel.

3 - Restore electrical supply to unit and set fan switch

to “Auto” or “On.” Move system selection switch to

“Heat” and adjust thermostat setting above room

temperature.

4 - The combustion air blower will start and burners will

light within 40 seconds.

5 - If burners do not light rst time (gas line not fully

purged), ignition system will attempt to light two

more times before locking out gas valve operation.

6 - If lockout occurs, repeat steps 1, 2 and 3 above.

B - To shut down unit operation:

1 - Set thermostat selection switch to “O” position,

remove heat control access panel and turn manual

knob on gas valve to “O” position.

2 - Replace heat control access panel.

C-Heating Adjustment

Check gas line pressure with unit ring at maximum rate. A

minimum of 10.8” w.c., and a maximum of 13.5” w.c. should

be maintained. Manifold pressure is preset as shown on

the appropriate conversion label provided in this kit.

No adjustment should be necessary. On multiple unit in-

stallations, each unit should be checked in sequence be-

ginning with the one closest to the supply gas main and

progressing to the one furthest from the main.

Identifying Unit As LP Converted

1 - Locate 580207-04, -05, and -08 conversion plate

labels provided in kit. Select the appropriate label

and discard the other two labels.

Note - 21A02 kits have one conversion plate; there are no

further labels to discard.

2 - Make a check mark in the appropriate box on the

conversion plate corresponding to unit model number

shown on nameplate. Ax appropriate conversion

plate near unit nameplate.

3 - Complete installer information on converter sticker

and ax to vestibule panel. Ax acrylic sheet over

converter sticker.

Lennox LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit Installation guide

Lennox LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit Installation guide

Lennox LGM/LGH/KD/KG/ZG/SG 024-090 LP Kit Installation guide

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